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Chaotic dynamics and optical power saturation in parity–time (PT) symmetric double-ring resonator

  • Jyoti Prasad Deka
  • Amarendra K. SarmaEmail author
Original Paper
  • 26 Downloads

Abstract

In this work, we report emergence of saturation and chaotic spiking of optical power in a double-ring resonator with balanced loss and gain, obeying the so-called parity–time symmetry. We have modeled the system using a discrete-time iterative equation known as the Ikeda map. In the linear regime, evolution of optical power in the system shows power saturation behavior below the PT threshold and exponential blowup above the PT threshold. We found that in the unbroken PT regime, optical power saturation occurs owing to the existence of stable stationary states, which lies on the surface of four-dimensional hypersphere. Inclusion of Kerr nonlinearity into our model leads to the emergence of a stable, chaotic and divergent region in the parameter basin for period-1 cycle. A closer inspection into the system shows us that the largest Lyapunov exponent blows up in the divergent region. It is found that the existence of high nonnegative largest Lyapunov exponent causes chaotic spiking of optical power in the resonators.

Keywords

Chaos Ikeda Parity–time symmetry Resonators 

Notes

Acknowledgements

J.P.D. would like to thank MHRD, Government of India, for financial support through a fellowship, and A.K.S. would like to acknowledge the financial support from DST-SERB, Government of India (Grant No. SB/FTP/PS-047/2013).

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Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  1. 1.Department of PhysicsIndian Institute of Technology GuwahatiGuwahatiIndia

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